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Using Square Workflow for Android & iOS
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Mohit S
May 18, 2022
Programming
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Using Square Workflow for Android & iOS
Mohit S
May 18, 2022
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Transcript
Mohit Sarveiya Using Square Workflow for Android & iOS @heyitsmohit
Using Square Workflow for Android & iOS • Purpose •
Building screens & setting up state • Working with Compose
Purpose • Clear boundaries between components • Immutable State •
Separation between state & UI
Workflow
Workflow (State)
Workflow (State) Actions
Workflow (State) Actions
Workflow (State) Rendering
Action UI
Action UI State
Action UI State Rendering
Action UI State Rendering
Creating Workflows • State • Actions • Screens
Square Workflow with Android Screens, Workflows & Renderings
9:41 Login Username Password
Workflow Layout Runner Screen
Setup • AndroidX View Model • View Binding
Screen • Represents view model for screen
Screen data class LoginScreen( val username: String, Val password: String,
val onLoginClicked: () -> Unit )
Layout Runner • Specifies how to update views • Supports
view binding
Layout Runner class LoginLayoutRunner( val loginViewBinding: LoginViewBinding ) : LayoutRunner<LoginScreen>
{ }
Layout Runner override fun showRendering(rendering: LoginScreen) { loginViewBinding.username.text = rendering.username
loginViewBinding.username.setTextChangedListener { rendering.onUsernameChanged(it.toString()) } loginViewBinding.login.setOnClickListener { rendering.onLoginClicked() } }
Layout Runner override fun showRendering(rendering: LoginScreen) { loginViewBinding.username.text = rendering.username
loginViewBinding.username.setTextChangedListener { rendering.onUsernameChanged(it.toString()) } loginViewBinding.login.setOnClickListener { rendering.onLoginClicked() } }
Layout Runner override fun showRendering(rendering: LoginScreen) { loginViewBinding.username.text = rendering.username
loginViewBinding.username.setTextChangedListener { rendering.onUsernameChanged(it.toString()) } loginViewBinding.login.setOnClickListener { rendering.onLoginClicked() } }
Layout Runner override fun showRendering(rendering: LoginScreen) { loginViewBinding.username.text = rendering.username
loginViewBinding.username.setTextChangedListener { rendering.onUsernameChanged(it.toString()) } loginViewBinding.login.setOnClickListener { rendering.onLoginClicked() } }
Workflow Layout Runner Screen
Workflow (State) Rendering Actions
data class State( val username: String, val password: String )
State
fun onUsernameChanged(username: String) = action { state = state.copy(username =
username) } Action
object LoginWorkflow : StatefulWorkflow<State, LoginScreen> { } Workflow
object LoginWorkflow : StatefulWorkflow<State, LoginScreen> { override fun initialState() {
} override fun render() { } } Workflow
object LoginWorkflow : StatefulWorkflow<State, LoginScreen> { override fun initialState() {
} override fun render() { } } Workflow
fun render(renderState: State) { } Workflow
fun render(renderState: State): LoginScreen { } Workflow
fun render(renderState: State): LoginScreen { LoginScreen( username = renderState.username, onUsernameChanged
= { ... }, onLoginCliked = {} ) } Workflow
fun render(renderState: State): LoginScreen { LoginScreen( username = renderState.username, onUsernameChanged
= { ... }, onLoginCliked = {} ) } Workflow
fun onUsernameChanged(username: String) = action { state = state.copy(username =
username) } Action
fun render(renderState: State): LoginScreen { LoginScreen( username = renderState.username, onUsernameChanged
= { context.actionSink.send() }, onLoginCliked = {} ) } Workflow
fun render(renderState: State): LoginScreen { LoginScreen( username = renderState.username, onUsernameChanged
= { context.actionSink.send(onUserChanged(it)) }, onLoginCliked = {} ) } Workflow
fun initialState(): State { State( username = "" ) }
Workflow
Workflow (State) Rendering Actions
View & View Model View View Model Workflow
View Model class LoginViewModel : ViewModel() { val renderings: StateFlow<LoginScreen>
by lazy { renderWorkflowIn( workflow = LoginWorkflow, scope = viewModelScope, savedStateHandle = savedState ) } }
View Model class LoginViewModel : ViewModel() { val renderings: StateFlow<LoginScreen>
by lazy { renderWorkflowIn( workflow = LoginWorkflow, scope = viewModelScope, savedStateHandle = savedState ) } }
View class LoginActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?)
{ super.onCreate(savedInstanceState) val model: LoginViewModel by viewModels() setContentView( WorkflowLayout(this).apply { start(model.renderings) } ) } }
View class LoginActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?)
{ super.onCreate(savedInstanceState) val model: LoginViewModel by viewModels() setContentView( WorkflowLayout(this).apply { start(model.renderings) } ) } }
View class LoginActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?)
{ super.onCreate(savedInstanceState) setContentView( WorkflowLayout(this).apply { start(model.renderings) } ) } }
Workflow Layout Runner Screen
9:41 Login Username Password
Action UI State Rendering
Navigation & Props
Workflow B Workflow A Props
9:41 Login Username Password
9:41 Login Username Password 9:41 Username
Todo Workflow Login Workflow Root Workflow
Root Workflow • Navigation States • Backstack
sealed class State { object Login : State() } State
sealed class State { object Login : State() data class
Todo(val username: String) : State() } State
Root Workflow object RootWorkflow : StatefulWorkflow { }
Root Workflow object RootWorkflow : StatefulWorkflow { fun render( renderProps:
Unit, renderState: State, context: RenderContext ): BackStackScreen<Any> }
Root Workflow fun render( ... ): BackStackScreen<Any> { val
backstackScreens = mutableListOf<Any>() }
Root Workflow fun render( ... ): BackStackScreen<Any> { val
loginScreen = context.renderChild(LoginWorkflow) }
Root Workflow fun render( ... ): BackStackScreen<Any> { val
loginScreen = context.renderChild(LoginWorkflow) backstackScreens += loginScreen }
Root Workflow fun render( ... ): BackStackScreen<Any> { when
(renderState) { is Todo -> { } } }
Root Workflow fun render( ... ): BackStackScreen<Any> { when
(renderState) { is Todo -> { val todoScreen = context.renderChild(TodoWorkflow) backstackScreens += todoScreen } } }
Todo Workflow Login Workflow Root Workflow
Todo List Screen data class TodoListScreen( val username: String, val
todoTitles: List<String> )
Todo Workflow State data class State( val todos: List<TodoModel> )
Todo Workflow State fun initialState() = State( listOf( TodoModel( title
= "Workout", note = "Workout" ) ) )
Todo Workflow Login Workflow Props Username
Props object TodoListWorkflow : StatefulWorkflow() { data class ListProps(val username:
String) }
Todo Workflow Login Workflow Root Workflow
Root Workflow fun render( ... ): BackStackScreen<Any> { when (renderState)
{ is Todo -> { val todoScreen = context.renderChild(TodoWorkflow) backstackScreens += todoScreen } } }
Root Workflow fun render( ... ): BackStackScreen<Any> { when (renderState)
{ is Todo -> { val todoScreen = context.renderChild( TodoWorkflow, ListProps(username = renderState.username) ) } } }
View Model View
View Model class LoginViewModel : ViewModel() { val renderings: StateFlow<LoginScreen>
by lazy { renderWorkflowIn( workflow = LoginWorkflow, scope = viewModelScope, savedStateHandle = savedState ) } }
View Model class LoginViewModel : ViewModel() { val renderings: StateFlow<LoginScreen>
by lazy { renderWorkflowIn( workflow = RootWorkflow, scope = viewModelScope, savedStateHandle = savedState ) } }
Todo Layout Runner Login Layout Runner
View Registry val viewRegistry = ViewRegistry( BackStackContainer, LoginLayoutRunner, TodoListLayoutRunner )
View Registry setContentView( WorkflowLayout(this).apply { start(model.renderings, viewRegistry) } )
Todo Workflow Login Workflow Root Workflow
9:41 Login Username Password 9:41 Username
Square Workflow with Jetpack Compose
9:41 Hello 9:41 Goodbye
Workflow Binding
Rendering data class Rendering( val message: String, val onClick: ()
-> Unit )
Binding composeScreenViewFactory<HelloWorkflow.Rendering> { rendering, _ -> Text( rendering.message, modifier =
Modifier .clickable(onClick = rendering.onClick) .fillMaxSize() .wrapContentSize(Alignment.Center) ) }
Binding composeScreenViewFactory<HelloWorkflow.Rendering> { rendering, _ -> Text( rendering.message, modifier =
Modifier .clickable(onClick = rendering.onClick) .fillMaxSize() .wrapContentSize(Alignment.Center) ) }
State enum class State { Hello, Goodbye; fun theOtherState(): State
= when (this) { Hello -> Goodbye Goodbye -> Hello } }
Action val helloAction = action { state = state.theOtherState() }
Workflow object HelloWorkflow : StatefulWorkflow { }
Workflow object HelloWorkflow : StatefulWorkflow { override fun render():
Rendering = Rendering( message = renderState.name, onClick = { context.actionSink.send(helloAction) } ) }
Action UI State Rendering
9:41 Hello 9:41 Goodbye
None
None
Thank You! www.codingwithmohit.com @heyitsmohit